Geodesic
The Pedal Surfaces of (1,2)-Congruences with a One-Parameter Set of Ellipses
Journal for geometry and graphics, Tome 1 (1997) no. 2, pp. 135-15 Cet article a éte moissonné depuis la source Heldermann Verlag

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In the 3-dimensional Euclidean space (the model of the 3-dimensional projective space) among the surfaces of 4th order with a nodal line those through the absolute conic are extracted as a special class which contains the pedal surfaces of (1,2)-congruences. One class of these surfaces is classified with regard to the number and types of their real singular points. These surfaces have been visualized using the program Mathematica 3.0. 
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     author = {S. Gorjanc},
     title = {The {Pedal} {Surfaces} of {(1,2)-Congruences} with a {One-Parameter} {Set} of {Ellipses}},
     journal = {Journal for geometry and graphics},
     pages = {135--15},
     year = {1997},
     volume = {1},
     number = {2},
     url = {http://geodesic.mathdoc.fr/item/JGG_1997_1_2_a3/}
}
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S. Gorjanc. The Pedal Surfaces of (1,2)-Congruences with a One-Parameter Set of Ellipses. Journal for geometry and graphics, Tome 1 (1997) no. 2, pp. 135-15. http://geodesic.mathdoc.fr/item/JGG_1997_1_2_a3/